Polydentate ligands

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Alan Wu
Posts: 61
Joined: Sat Sep 14, 2019 12:16 am

Polydentate ligands

Postby Alan Wu » Sat Nov 23, 2019 6:02 pm

How do we precisely know if a ligand is polydentate? For example, the O in water has 2 lone pairs of electrons, but it is monodentate. Then oxalate has 4 Os, each with 2 lone pairs of electrons, but it is bidentate. Why is that the case?

Ethan Lam 4A
Posts: 69
Joined: Thu Jul 11, 2019 12:17 am

Re: Polydentate ligands

Postby Ethan Lam 4A » Sat Nov 23, 2019 7:03 pm

A ligand is polydentate if it has more than one bonding atom. H20 is a monodentate despite having two electron pairs because the molecule is not long enough to reach the other bonding site of the metal. Oxalate is bidentate because it can only reach around the metal in two bonding sites.

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